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LT1375HVIS8 Datasheet(PDF) 8 Page - Linear Technology |
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LT1375HVIS8 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 28 page  8 LT1375/LT1376 High switch efficiency is attained by using the BOOST pin to provide a voltage to the switch driver which is higher than the input voltage, allowing switch to be saturated. This boosted voltage is generated with an external capaci- BLOCK DIAGRAM tor and diode. Two comparators are connected to the shutdown pin. One has a 2.38V threshold for undervoltage lockout and the second has a 0.4V threshold for complete shutdown. – + – + – + Σ INPUT 2.9V BIAS REGULATOR 500kHz OSCILLATOR FREQUENCY SHIFT CIRCUIT VSW FB VC GND 1375/76 BD SLOPE COMP 0.1 Ω BIAS INTERNAL VCC CURRENT SENSE AMPLIFIER VOLTAGE GAIN = 10 SYNC SHUTDOWN COMPARATOR CURRENT COMPARATOR ERROR AMPLIFIER gm = 2000µMho FOLDBACK CURRENT LIMIT CLAMP BOOST RS FLIP-FLOP DRIVER CIRCUITRY S R 0.9V LOCKOUT COMPARATOR 0.4V 3.5 µA Q2 Q1 POWER SWITCH 2.38V 2.42V – + SHDN Figure 1. Block Diagram APPLICATIONS INFORMATION FEEDBACK PIN FUNCTIONS The feedback (FB) pin on the LT1376 is used to set output voltage and also to provide several overload protection features. The first part of this section deals with selecting resistors to set output voltage and the remaining part talks about foldback frequency and current limiting created by the FB pin. Please read both parts before committing to a final design. The fixed 5V LT1376-5 has internal divider resistors and the FB pin is renamed SENSE, connected directly to the output. The suggested value for the output divider resistor (see Figure 2) from FB to ground (R2) is 5k or less, and a formula for R1 is shown below. The output voltage error caused by ignoring the input bias current on the FB pin is less than 0.25% with R2 = 5k. A table of standard 1% values is shown in Table 1 for common output voltages. |
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